This is what I got in a search.
http://code.google.com/p/emfplugin/
"As of Windows Vista and Window 7, the Microsoft
Windows Explorer
no longer displays thumbnails image previews of EMF
(Enhanced Metafile) and WMF (Windows Metafile)
vector graphic images.
This Windows Explorer plug-in restores this
capability."
You just gotta LOVE Microsoft. Removing useful features and
adding spyware and bloat. Just out of curiosity, how big is your
entire Windows directory (folder)?
It's hard to guess, what kind of security exposure such a
plugin causes. Or whether the designer of the plugin issues
updates, if security issues are discovered.
I don't know what you do, but you could just convert WMF files
to another format. There are dozens of batch
converters/resizers. If you HAVE to use WMF, I agree, caution is
indicated, as with any MS product/format.
The pictures in the example image, don't look that nice, so
I'm not even sure the thumbnails will be suitable for
sorting the images.
First of all, Windows Explorer is NOT a file manager. It is a
torture device whose primary function is to prevent a new
computer user from understanding the basic principles of file
and directory organization, to keep him/her as ignorant as
possible, and to allow only the most basic of functions, the
execution of which is designed to be as troublesome as possible.
Second of all, I in no way suggested you use WE, even with an
add on, as nothing will ever make that piece of garbage useful
for ANYTHING.
Here's an example of twhat I was talking about, free:
http://www.fookes.com/ezthumbs/
They also make a fantastic (and also free) Notepad replacement.
http://www.fookes.com/downloads.php?product=notetab
(The "Light" version is free.)
If you ever want to get some real control over your computer,
try a real file manager. I recommend the one from
www.ghisler.com but there are about a dozen other good ones.
(Stay away from WE modifications, it's just more crap on top of
a big pile of crappy code.)
TC from Ghisler will run forever in demo mode, but it's well
worth paying for. It has a page of available plugins that will
blow your mind, including thumbnails, FTP, and file-management
options that would give MS nightmares. It integrates with Irfan
View to give you graphics capabilities you never dreamed were
possible.
If you just want a single program for thumbnails and don't like
ezthumbs, here's another nice one, also free for private use:
http://www.wildbit-soft.fi/index.html
And a sample of what /else/ is out there:
http://download.cnet.com/windows/image-viewers/
Like I said, there are MANY.